/Engine/Source/Editor/StaticMeshEditor/Public/StaticMeshEditorSubsystem.h
Get the Nanite Settings for the mesh
void SetNaniteSettings ( [UStaticMesh](API\Runtime\Engine\Engine\UStaticMesh) * StaticMesh, [FMeshNaniteSettings](API\Runtime\Engine\Engine\FMeshNaniteSettings) NaniteSettings, bool bApplyChanges )